化學
化學反應、化學計量、分子結構與元素性質。
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arrive at a conclusion if morality represents the way we would like the…
The majority of people are honest.
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read this passage. an official statement from the culinary institute in…
A. The information comes from an official statement.
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world war i (wwi) took place in europe from 1914 to 1918. the united st…
B. "At the time, no one knew that there would be another world war. It was such a big, destructive war that he thought it would be the last one."
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part 1 of 2 what is the hybridization state of c in ch₄? select the sin…
Part 1: \(sp^{3}\) Part 2: \(sp^{3}\)
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consider the reaction: bf₃ + ncl₃ → f₃b - ncl₃ part 1 of 2 what changes…
- Part 1 of 2: None of the above. - Part 2 of 2: Before the reaction nitrogen is \(sp^3\) hybridized, and after the reaction it is \(sp^3\) hybridized.
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consider the reaction: bf₃ + ncl₃ → f₃b - ncl₃ part 1 of 2 what changes…
None of the above.
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the incentive scheme that rules sumo is intricate and extraordinarily p…
Ranking is everything.
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question 11 lipids and water do not mix well. for this reason, mixtures…
Emulsions
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question 1 how does solvent density affect the diffusion rate? denser s…
Higher solvent density decreases the diffusion rate.
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unit 1 - challenge 1.2: chemistry learning objective: recognize the str…
C. Trans fats
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unit 1 - challenge 1.2: chemistry of life in a mixture of saltwater, th…
C. Solute
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which member of each of the following pairs of substances would you exp…
- Part 1 of 2: \(I_2\) - Part 2 of 2: \(SO_2\)
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name: dalton spicer date: i pledge: 1. list the four major elements nee…
1. Carbon, Oxygen, Hydrogen, Nitrogen 2. C. Trace elements 3. b. Electrons 4. Electrons are negative charged, Neutrons are neutral charged, protons are positive charged 5. c. Adhe…
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question 1 - 19 what makes metals good conductors? free moving electron…
free moving electrons
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question 1 - 13 under what conditions can lithium chloride conduct elec…
only when melted or dissolved in water
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question 1 - 10 the correct formula for nickel(ii) oxide is nio nio₂ ni…
None of the options \(A.NiO\), \(B.NiO_2\), \(C.Ni_2O\), \(D.Ni_3O_2\) is correct. But if we assume a misprint and consider the valency in a very basic (incorrect from a strict io…
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question 1.9 which of the following compounds contains the lead(iii) io…
None of the options are correct as per the charge - balancing calculations for lead (II) ion. If we assume a typo and consider common lead (II) compounds: - For \(PbO\): Let \(Pb\…
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question 1 - 7 what group of elements form anions? metals nonmetal halo…
B. nonmetal
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question 1 - 5 which of the following pairs of elements is most likely …
Magnesium and fluorine.
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question 1.3 which answer below correctly lists the formulas for the io…
calcium fluoride → \(Ca^{2+}\), \(F^{-}\)
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nitrogen at the center of $-nh_{2}$ bent trigonal planar trigonal pyram…
bent
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question 1 - 15 which polyatomic ion is carbonate? nh₄ co₃ so₄ po₄
\(CO_{3}\) (assuming the intended ion is \(CO_{3}^{2 -}\))
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select the single best answer in each part that describes the molecular…
Part 1: tetrahedral Part 2: tetrahedral
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question 6 of 18 sedimentary rocks are made from- (1 point) a. only met…
- Question 6: B. sediment or many broken rock pieces that are compacted together. - Question 7: B. Heat and pressure - Question 8: B. False - Question 9: A. Become another rock - …
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using the vsepr model, predict the molecular geometry of alcl₃ (bent, l…
trigonal planar
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question 6 (1 point) physical activity and aerobic exercise will do whi…
Prevent and help control diabetes
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a. circle the element with the lower reactivity: 1. nitrogen or fluorin…
A. 1. Nitrogen, 2. Tellurium, 3. Aluminum, 4. Iodine B. 1. Neon, 2. Krypton, 3. Arsenic, 4. Aluminum C. 1. Chlorine, 2. Strontium, 3. Potassium, 4. Fluorine D. 1. Barium, 2. Chlor…
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g. circle the element with the larger radius: 1. aluminum or sodium 2. …
- **G. Larger Radius**: - 1. Sodium - 2. Barium - 3. Chlorine - 4. Calcium - **H. Lowest Electronegativity**: - 1. Sodium - 2. Gallium - 3. Iodine - 4. Barium
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in which pair does the first atom or ion have a larger radius than the …
B. \(Br, Br^-\)
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1) calculate the number of valence electrons in hydrogen cyanide, hcn. …
\(10\)
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claiming conservation quick check use the equation for the formation of…
No, it does not because the number and mass of atoms are conserved even though the number of molecules is not.
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methane (ch₄) and oxygen (o₂) combine to make carbon dioxide (co₂) and …
two
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claiming conservation quick check which statement accurately describes …
Reactant bonds break and atoms rearrange to form new product combinations.
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claiming conservation quick check in photosynthesis, carbon dioxide (co…
12 oxygen atoms
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hydrogen (h₂) and oxygen (o₂) combine to make water (h₂o) in the follow…
B. six
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1) calculate the number of valence electrons in water, h₂o. valence ele…
\(8\)
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chemistry: how much hcl (hydrochloric acid) is in a 90 - milliliter bot…
72
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6.3 score: 6.5/17 answered: 7/17 question 8 number of students: in a ce…
\(192\)
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1) calculate the number of valence electrons in nitrogen trichloride, n…
\(26\)
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complete the sentence with the past progressive form of the verb. hassa…
was sitting
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in a chemical process, the atoms in the reactants are arranged differen…
During photosynthesis, some chemical bonds between atoms in carbon dioxide gas (\(CO_2\)) and water (\(H_2O\)) molecules are broken. As atoms are rearranged, new chemical bonds ar…
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how do carbon dioxide, water, glucose, and oxygen differ? select all th…
All options (the combination of bonds, the arrangement of atoms, the combination of atoms) apply.
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in a chemical process such as photosynthesis, the reactants and product…
| Chemical bonds | Carbon dioxide | Water | Glucose | Oxygen | |--|--|--|--|--| | a carbon atom connected to another carbon atom | No | No | Yes | No | | an oxygen atom connected …
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the reactants and products of photosynthesis are made of the same amoun…
\(6CO_{2}+6H_{2}O ightarrow C_{6}H_{12}O_{6}+6O_{2}\)
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1) calculate the number of valence electrons in methylene chloride, ch₂…
20
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carbon, hydrogen, and oxygen atoms make up carbon dioxide gas and water…
| Type of atom | Number of atoms in 6 molecules of carbon dioxide | Number of atoms in 6 molecules of water | Total number of atoms in reactants | |---|---|---|---| | H | $0$ | $1…
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carbon dioxide water glucose oxygen reactants products complete the tab…
| Types of atom | Carbon dioxide | Water | Glucose | Oxygen | | --- | --- | --- | --- | --- | | Hydrogen (H) | No | Yes | Yes | No | | Carbon (C) | Yes | No | Yes | No | | Oxygen …
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balancing equations worksheet 1)_____na3po4 +_____koh→_____naoh +_____k…
1. \(1Na_3PO_4 + 3KOH = 3NaOH+1K_3PO_4\) 2. \(1MgF_2 + 1Li_2CO_3 = 1MgCO_3+2LiF\) 3. \(1P_4 + 3O_2 = 2P_2O_3\) 4. \(2RbNO_3 + 1BeF_2 = 1Be(NO_3)_2+2RbF\) 5. \(2AgNO_3 + 1Cu = 1Cu(…
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select the diamagnetic species from the following: (a) hnc, (b) o₂²⁻, (…
(a) HNC, (b) \(O_{2}^{2 - }\), (e) \(H_{2}\)
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why is the structure either not important or less important? select the…
less important (positive formal charge on oxygen)
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select not important or less important structures. check all that apply…
First structure \( :O\equiv\ddot{C}- \ddot{O}: \), Second structure \( :\ddot{O}-C-\ddot{O}: \), Third structure \( :O\equiv C-\ddot{O}: \)
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key formulas & constants • 1 mole = 6.022 × 10²³ particles (avogadros n…
| Substance | Molar Mass (g/mol) | Problem | Show Work (2 pts) | Ans (1 pt) | |---|---|---|---|---| | \(H_{2}O\) | \(18.02\) | How many moles are in \(45.0\ g\) of water? | \(45.0…
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what is a major difference in structure between ch4 and nh? color of ce…
Number of bonds on central atom
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question 11 what is a major difference in structure between ch4 and nh3…
Appearance of lone pairs of electrons.
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14. is the following reaction balanced? 6co₂ + 6h₂o → c₆h₁₂o₆ + 6o₂ a) …
A. Yes
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how many neutrons does phosphorus 32 have?* 2 points your answer
\(17\)
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what is the property of water that allows it to require a massive amoun…
High heat capacity
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12. in a chemical reaction, what are the new substances produced called…
12. B. Products 13. E. Combustion (assuming the option E is Combustion. If not, based on the general reaction type where a hydrocarbon reacts with oxygen to form carbon dioxide an…
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match the following terms with their definitions in the context of wate…
- Solute: Substance that is dissolved in a solution. - Solvent: Substance, often a liquid, used to dissolve another substance. - Solution: A mixture of a solute and a solvent. - S…
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class set - do not write on test!!!! midterm: chemistry 2025 - 2026 che…
C. 18
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stomach acid has a ph of 1 which makes it a?* weak base strong acid wea…
Strong Acid
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soap has a ph of 10 which makes it a?* weak base strong acid weak acid …
Weak Base
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which of the following sets of coefficients will balance the reaction? …
For the balancing coefficients question: A. \( 2,2,1 \) For the subscript meaning question: C. Atoms of an element
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milk has a ph of 6 which makes it a?* weak base strong acid weak acid s…
Weak Acid
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5. what type of reaction is this? fe + o₂ → fe₂o₃ a) synthesis c) singl…
A. Synthesis ### Question 6
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4. a student left an iron nail outside for several weeks, and it formed…
B. The iron reacted with oxygen and moisture to form a new compound, \(Fe_2O_3\).
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3. what does the arrow in a chemical reaction represent? a) yields b) r…
D. All of the above
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2. which of the following sets of coefficients will balance the reactio…
D. \(2,1,2,1\)
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class set - do not write on test!!! midterm: chemistry 2025 - 2026 chem…
A. 6
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a car engine changes chemical energy into what types of energy? mechani…
mechanical and thermal
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what type of energy transfer occurs when a helicopter is flying in the …
The chemical energy from the fuel is transformed into mechanical and sound energy.
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what is the best example of chemical energy? energy stored in chemical …
energy stored in chemical bonds
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processing memories in the brain requires memory consolidation: a gradu…
reinforcement in sleep
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question 7 1 pts which of the following statements is false? retrieving…
Once a long - term memory has been consolidated, it is impossible to distort it.
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part 2 of 4 write the compounds empirical formula and name. empirical f…
Empirical formula: \(SeBr_4\) Name: Selenium tetrabromide
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al and br is the compound likely to be ionic or covalent? select the si…
For Al and Br: ionic. For Se and Br: covalent.
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consider the following pairs of elements and the binary compounds they …
- Part 1: ionic - Part 2: - Empirical formula: \(AlBr_{3}\) - Name: aluminum bromide
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consider the following pairs of elements and the binary compounds they …
ionic
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classify the following bond as ionic, polar covalent, or nonpolar coval…
polar covalent
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16. which energy transformation occurs when flipping on a light switch?…
16. B. Mechanical to electrical 17. B. Heat 18. C. Metal spoon heating in coffee 19. C. A cup of coffee with a lid 20. A. Warm water rises and cool water sinks 21. A. Chemical to …
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there are four sketches below. the first sketch shows a sample of subst…
Change 1: a chemical change Change 2: a chemical change Change 3: a physical change
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a carbon atom has four valence electrons. how do all living things depe…
All living things depend on the properties of the carbon atom because carbon can form diverse covalent bonds. This allows for the creation of a wide variety of organic molecules. …
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the diagram shows the structure of valine, an amino acid. jan is resear…
C. adding an amino group (-NH2) to a carbon compound
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arroyo books sells new and used books, some long (with many pages) and …
1. Intensive 2. Extensive 3. Intensive
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the three particles that make up atoms are * neutrons, isotopes, and el…
Protons, neutrons, and electrons.
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isotopes are atoms of the same element with the same number of protons …
neutrons
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if an atom contains 11 protons and 12 neutrons, its atomic number is *
11
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the chemical structure of 2 - hydroxyethanal (ch₂ohcho) is shown below.…
Highlight the oxygen (\(O\)) and hydrogen (\(H\)) atoms in the -OH group (the \(O - H\) part in the structure).
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if an atom contains 3 protons, 4 neutrons, and 3 electrons, its mass nu…
7
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decide whether each pair of elements in the table below will form an io…
| element #1 | element #2 | Forms ionic compound? | empirical formula of ionic compound | |---|---|---|---| | bromine | sulfur | no | | | barium | sulfur | yes | \(BaS\) | | iodin…
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an unknown compound has the following chemical formula: p_x cl_3 where …
\(PCl_3\)
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classify each chemical compound: compound type of compound co₂ ionic mo…
- \(CO_2\): molecular - \(Fe(OH)_2\): ionic - \(CsI\): ionic
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what is the angle between the carbon - oxygen bond and one of the carbo…
\(120\)
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two students are developing a computer simulation of a chemical reactio…
A. lines that break and reform between the spheres
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lisa is investigating a chemical reaction involving carbon compounds. w…
C. The mass of carbon in the products is greater than the mass of carbon in the reactants.
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which of the following forms of alcohol can be consumed? a. propanol b.…
D. ethanol
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researchers have long debated the origins of silver used in european co…
D. speculative
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2. creativity and approach elijah says, \i used my instincts to figure …
Elijah's approach to dance and creativity is intuitive and organic. He likely values improvisation and personal expression, using his instincts to guide his creative process rathe…
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laxmi is a mother. the responsibilities and expectations associated wit…
role.
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nadine has strong feelings about a website used to enroll in health ins…
B. attitude